<template>
    <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="title" @keyup.enter="add"/>
        <!-- v-model="title" -->
    </div>
</template>

<script>
import {nanoid} from 'nanoid'
    export default {
        name:'MyHeader',
        data(){
            return {
                title:''
            }
        },
        methods:{
            add(e){
                if(!this.title.trim()) return alert('输入不能为空')
                //将用户的输入包装成一个todo对象
                // console.log(e.target.value)
                const todoObj = {id:nanoid(),title:this.title,done:false}
                //通知App组件添加一个todo
                this.$emit('receive',todoObj)
                //清空输入
                this.title=''
            }
        }
    }
</script>

<style scoped>
    /*header*/
    .todo-header input {
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
        }

        .todo-header input:focus {
        outline: none;
        border-color: rgba(82, 168, 236, 0.8);
        box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
        }
</style>
